Taboo Tattoo

After saving a homeless man from some thugs, Seigi receives a strange tattoo from the man as a gift. This act leads to a series of events that will pull Seigi into the middle of a conflict between a special U.S. Army unit and the Kingdom of Selinistan, as both are scrambling to collect powerful "spell crests" called Power Crests, weaponized ancient artifacts of great power which can shift the balance of power in the world.